This is full wishful thinking on his side. A quick Google search shows that his company, Microstrategy, owns 70,470 bitcoins. If you multiply this by 15 million, you get the value of 1 trillion dollars. So this is precisely the value that would make his bitcoins worth 1 trillion, which he then proceeds to rationalize (i.e. try to find a rational explanation to come to that). Notice that all of these economic reasonings he come up with could have given 14, 16, 20, whatever trillion as a result, but his prediction happens to be precisely the value that makes him a trillionaire. Big coincidence no?